In this verse, Shree Krishna has said that it is His energy which has brought about the appropriate physical conditions for life to exist on planet earth. Here,
gām
means earth, and
ojasā
is energy. Like all other celestial bodies, the earth is also a big mass of matter. But God has made it habitable, so that, it can sustain life.
Ever wondered, why ocean water is so salty? God could have made the oceans full of freshwater, but it would have become a breeding ground for diseases. Due to the high salt content of the ocean water, many disease-causing microorganisms cannot survive in it, thereby protecting life.
Similarly, several such amazing phenomena make earth inhabitable to a variety of species, of both movable, and static living beings. Nobel laureate and famous American scientist, George Wald has written in his book, A Universe that Breeds Life “If anyone of the considerable number of the physical properties of our universe were other than they are, then life, that now appears to be so prevalent, would be impossible, here or anywhere.”
Shree Krishna also says that the moonlight gets its nourishing properties from Him. And it is the ambrosial nectar of the moonlight that nourishes the entire plant life, i.e. fruits, vegetables, grains, herbs, etc.